Dust collector



Dec. 23, 1941.

N. B; WALDO DUST COLLECTOR Filed July 22, 1940 2 Sheets-Sheet 1 .NZlLZ B- I u wzu ron ATTORNEYS Dec. 23, 1941. N. B. WALDO DUST COLLECTOR 2 Shets-Sheet 2 Filed July 22, 1940 ATTORNEYS Patented Dec. 23, 1941 UNITED STATES PATENT 'GFF ICE DUST ioortno'ron 'Nei'lliB. Waldo, ane one. 7 Application July 22, 1940, :No. 3216354 4 Claims. (c1. its-ins) 1 My invention relates to milling machinery such as is used in connection with the manufacture -.of:.poultry feeds and'the like, and has among its objects and advantages the provision of an improvedzdustcollector.

In the manufacture of poultry feeds, alfalfa acmps, .as an example, are reduced to a finely ground condition and the grinding process is accompanied with an objectionable .dust condition and considerable waste of material in the form of .dust which passes to the atmosphere. The dust which :passes to the atmosphere is made up oisuch-finely.divided'particles as'to be carried away easily and escape collection through the medinm of dust collectors employed in the trade.

A further objection incident to escape'of large quantities of dust to the atmosphere resides in the z-iact that the dust ifioats to considerable distances about the surrounding neighborhood and dwellings and other property become dust laden.

Suchdust is valuable as a poultry feed ingredient and the escaped dust provides an'ideal ingredient in poultry ,ieed concentrates as well as a coloring agentifor poultry feeds. V :Accordingly, .an object of my invention .is to :provide a .dust collector which may be employed in :conjunction with conventional milling machineryand in which the-collector is so devised as to collect the greater part of the fine dust particles which heretofore have passed to the atmosphere. More specifically, Iprovide a dust collector :in the nature of a shed or building of considerable size.

The building is provided with a series of partitions upstanding from the floor and depending from the roof. The .dust is delivered to the building through the roof thereof, and the partitions upstanding from the floor terminate short of the building roof and the partitions depending from the roof terminate short of the floor; The'depending partitions are alternately positioned between the upstanding partitions and the building is provided with an air outlet in its roof but at the end opposite the dust and air inlet. All the partitions are so arranged as to provide a continuous and tortuous passage for the air and dust, and the partitions are so spaced as to increase the size of the passage as the air and dust moves toward the outlet. Thus the building or dust collector is of enormous size with respect to the dust and air inlet and the air and dust passage inside the collector is so fashioned that the air and dust is relatively free from motion so as to enable the dust to more effectively settle.

The lower part of the building constitutes a settling :chamber for the dust, .and the partitions are provided with horizontal corrugations which :more effectively collect the :dust. Much of the collected dust willladhere to the corrugated partitions and when the accumulations become sufiiciently great, the dust'will :fall to the floor. The corrugatedpartitions,.inconnection with the dust laden air which relatively vfree from motion, perform anzefiic-ientdust'collecting function. The building, while embodying the necessary .:structural strength .for the purpose intended, is :provideol with a series :of wall areas or :panels which may be ruptured or blown from their mountings in event of a .dust xplosion :so as to afford 'rprotection against destruction "of the building as a'whole.

Inthe accompanyingtdrawingsz Figure 1 is a vertical sectionalview .of a dust 'collectorin-accordance with my invention;

Figure "2 is a, sectional view along the line '22 r-zotFigurel; and

:Figure .3 is an elevational View ofone end of the building, with the building illustrated :frag- ,mentarily, showing the m'annerin which the i fra-me structure of the building maybe reinforced iron 45 terminatesshort of the roof [8 'to prov-ide accommodation for panels I19 which may com prise suitable fabric supported in :frames 20. -Frames 20, while being securely :fastened against accidental displacement, may .beremovably attached to the frames IS in such manner as to tear loose easily in the event of a dust explosion so as to afford protection for the building structure in general. One means of securing the frames 20 may comprise small nails which adequately support the frames against accidental removal under normal operating conditions.

According to Fig. 2, an inlet pipe 2! is secured to a neck 22 fashioned on the roof l8, which pipe has communication with the milling machinery (not shown). As a rule, the air and dust escaping from the milling machinery escape through a screen or filter known inthe trade as a cyclone cleaner. Roof I8 is provided with a relatively large pipe 23 covered by a canopy 24 and attached to a neck 25 fashioned on the roof. Pipe 23 constitutes an outlet for air blown into the building [0, and the canopy 24 provides a shield against the entrance of moisture such as rain.

To the side walls I3 and M of the buildin structure and its roof l8 are secured two partitions 26 and 21, which partitions have their lower ends spaced ten or eleven feet above the floor line 28. A third partition 29 is secured to the side walls of the building and rests on the floor thereof, but the upper end of the partition 29 terminates short of the roof l8. Thus airentering the building structure passes downwardly of the passage branch 30, about the lower end of the partition 26 and upwardly in the passage branch 3|. The air then moves across the upper end of the partition 29 and downwardly in the passage branch 32 after .which .the air passes underneath the lower end of the partition 21 and then flows upwardly in the branch passage -33 which has communication with the outlet pipe 23. Passage branches 30, 31, 32 and 33 extend the full width of the building structure, but the partitions 26, 29 and 2! are spaced progressively farther apart when viewed from left to right in systems employ dust cleaners, a large amount of dust finds its way to the atmosphere. Large areas surrounding a mill become covered. with the fine dust. Then, too, dust heretofore passed to the atmosphere has an important value as an ingredient in concentrates. the dust laden air enters the building 10 and is caused to circulate in a tortuous path as Well as to progressively lessen its velocity to the end that the air becomes relatively free from motion. Thus the dust is given a chance to settle and collect on the exposed wall and partition surfaces in the building. The horizontal corrugations increase the dust collecting properties of the exposed surfaces and the building is of such proportions with respect to the volume of dust laden air entering therein 'as to provide ample room for dust settling to the bottom of the building and to provide a passage which renders the air substantially free from motion.

Fig. 1 illustrates the wall H as beingprovided with doors 34 and 35- which permits removal of dust collecting in the building. Fig. 1 illustrates In the present case,

a deflector 38 supported from the roof I8 and located coaxially with the tube 23. Deflector 36 tends to deflect the outgoing air in a more circuitous path.

Having thus described certain embodiments of my invention in detail, it is, of course, understood that I do not desire to limit the scope thereof to the exact details set forth except insofar as those details may be defined in the appended claims.

I claim:

1. A dust collector of the type described comprising a housing having an inlet and an outlet, vertically extending partitions in the housing arranged to coact with the walls thereof to provide a tortuous air passage between the inlet and the outlet, said partitions being so spaced with respect to one another and some of the walls of the housing as to provide a progressively increasing volumetric capacity in the direction of said outlet, said partitions and said walls being provided with horizontal dust collecting corrugations extending transversely of the direction of air flow through the passage.

2. A dust collector of the type described comprising a building having an air inlet and an air outlet in the roof structure thereof, partitions depending from the roof structure and a partition extending upwardly from the floor of the building, said partitions being spaced one from the other and with respect to said walls of the building to provide a tortuous air passage having a progressively increasing volumetric capacity in the direction of said outlet, thewalls of the building and said partitions being formed of corrugated sheet material, and said corrugations extending horizontally.

3. A dust collector of the type described comprising an enclosure having an inlet and an outlet for dust laden air, said enclosure being provided with vertically extending partitions relatively spaced and arranged to provide a tortuous passage extending between said inlet and said outlet, said passage progressively increasing in volumetric capacity from the inlet to the outlet, and said partitions being provided with dust collecting corrugations extending transversely of the direction of air flow through said passage. 1

4. A dust collector of the type described comprising a housing having an inlet and an outlet for dust laden air, vertically extending partitions in said housing arranged to provide a tortuous air passage between the inlet and the'outlet, and horizontal dust collecting corrugations formed in the partitions and the walls of the housing and extending transversely of the direction of air flow through the passage, with the bottom part of the housing comprising a settling chamber for dust.

NEILL B. WALDO. 

